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A general revision of the Palaemonidae (Crustacea decapoda natantia) of the Americas. 1. The subfamilies Euryrhynchinae and Pontoniinae

A general revision of the Palaemonidae (Crustacea decapoda natantia) of the Americas. 1. The subfamilies Euryrhynchinae and Pontoniinae, Introduction, p. 1

A GENERAL REVISION OF THE PALAEMONIDAE
(CRUSTACEA DECAPODA NATANTIA) OF THE
AMERICAS. I. THE SUBFAMILIES EURYRHYNCHINAE
AND PONTONIINAE
By LlPKE B. Holthuis
Research Associate
Allan Hancock Foundation
INTRODUCTION
Heretofore our knowledge of the American Palaemonidae was so
confused, and the descriptions of and remarks on the several species
scattered over such a large number of more or less important papers,
that it was very difficult to get a correct idea of the size, the status,
and the distribution of the various species.
When beginning the study of the Palaemonid material collected by
the Allan Hancock Expeditions during the years 1931-1941, it at first
was the intention to restrict this study to the West-American forms.
This, however, soon proved to be very inconvenient. In the first place, the
material, though for the far greater part collected along the Pacific
shores of America, contained several items, collected during the 1939
Expedition in the Caribbean Sea, which were too important to remain
unpublished, but not important enough to justify separate publication.
Secondly, the study of the West-American material (especially of the
species of the genus Macrobrachium) proved to be impossible without
a thorough knowledge of the East-American species. The study of the
latter, however, brought so many new factors to light, that it was
thought desirable to give a revision of all the American representatives
of the present family. The present paper therefore contains a complete
list of all known American Palaemonidae, with keys to all genera and
species, giving the full synonymy and the distribution of each species.
Furthermore a description and figures of each species, if possible, are
given. It is hoped to contribute in this way to a better understanding
of one of the most important groups of Caridea.
This report is based in the first place on the extensive and well
preserved collections made by the Allan Hancock Expeditions during
the years 1931-1938, 1940, 1941 along the Pacific American coast from
California to Peru, the Galapagos Islands and that of 1939 to the
[1]

A GENERAL REVISION OF THE PALAEMONIDAE
(CRUSTACEA DECAPODA NATANTIA) OF THE
AMERICAS. I. THE SUBFAMILIES EURYRHYNCHINAE
AND PONTONIINAE
By LlPKE B. Holthuis
Research Associate
Allan Hancock Foundation
INTRODUCTION
Heretofore our knowledge of the American Palaemonidae was so
confused, and the descriptions of and remarks on the several species
scattered over such a large number of more or less important papers,
that it was very difficult to get a correct idea of the size, the status,
and the distribution of the various species.
When beginning the study of the Palaemonid material collected by
the Allan Hancock Expeditions during the years 1931-1941, it at first
was the intention to restrict this study to the West-American forms.
This, however, soon proved to be very inconvenient. In the first place, the
material, though for the far greater part collected along the Pacific
shores of America, contained several items, collected during the 1939
Expedition in the Caribbean Sea, which were too important to remain
unpublished, but not important enough to justify separate publication.
Secondly, the study of the West-American material (especially of the
species of the genus Macrobrachium) proved to be impossible without
a thorough knowledge of the East-American species. The study of the
latter, however, brought so many new factors to light, that it was
thought desirable to give a revision of all the American representatives
of the present family. The present paper therefore contains a complete
list of all known American Palaemonidae, with keys to all genera and
species, giving the full synonymy and the distribution of each species.
Furthermore a description and figures of each species, if possible, are
given. It is hoped to contribute in this way to a better understanding
of one of the most important groups of Caridea.
This report is based in the first place on the extensive and well
preserved collections made by the Allan Hancock Expeditions during
the years 1931-1938, 1940, 1941 along the Pacific American coast from
California to Peru, the Galapagos Islands and that of 1939 to the
[1]